Have played it on my mates PS3, and think with TS it'll be great on the PC. Add the ability to form "gangs", and I'd say we'll see other clans on it as well. Less "move to it", and more "playing it for the craic", though.
As you can do "missions", I'm wondering if it'll allow us to set it so that you can only use set default weapons. If so, it could be seen as a way to have standard custom missions that two clans could play versus each other on a large scale.